The force that one surface exerts on another when the two rub against each other.
What is friction?
100
The product of an objects mass and its velocity.
What is momentum?
100
Any object that travels around another object in space.
What is a satellite?
200
An object at rest will remain at rest and an object in motion will continue in motion unless the object is acted upon by an unbalanced force.
What is Newton's First Law of Motion?
200
When an object rolls over a surface.
What is rolling friction?
200
The friction that occurs when an object moves through a liquid or a gas.
What is fluid friction?
200
The total momentum is the same before and after an event, as long as there are not outside forces.
What is the law of conservation of momentum?
200
Any force that causes an object to move in a circle.
What is centripetal force?
300
Equal forces acting on one object in opposite directions.
What are balanced forces?
300
An object that is thrown.
What is projectile?
300
The strength of the force of friction depends on these two factors.
What are the types of surfaces involved and how hard the surfaces push together.
300
If one object exerts a force on another object, then the second object exerts a force of equal magnitude in the opposite direction on the first object.
What is Newton's Third Law of Motion?
300
When a rocket is launched what is the direction of the direction of the reaction force?
The direction of a rocket's reaction force is upward.
400
The net force on an object is the product of its acceleration and its mass.
What is Newton's second law of motion?
400
The force of gravity acts between all objects in the universe.
What is the law of universal gravitation?
400
9.8 m/s^2
What is the rate at which in object in free fall accelerates?
400
What is the momentum of a bird with a mass of 0.018 kg flying at 15 m/s?
What is 0.27 kg*m/s
400
Why doesn't an orbiting satellite fall back to Earth?
As the satellite falls, the surface of Earth curves away.
500
Suppose you double the force acting on one object. In what way could you change its mass to keep its acceleration unchanged?
If you double the net force acting on an object, you have to double the mass of the object to keep the acceleration unchanged.
500
A squirrel drops a nut over a cliff. What is the velocity of the nut after 5 seconds?
49 m/s
500
Weight is a measure of the force of gravity acting on an object. Mass is a measure of the amount of matter in that object.
What is the difference between weight and mass?
500
Which has more momentum, a 250 kg dolphin swimming at 6 m/s, or a 450 kg dolphin swimming at 2 m/s ?
The dolphin has a greater momentum (1,500 kg*m/s) than the manatee (900 kg*m/s).